Detachable inflight headset for civil aircraft

Claim 1

A detachable inflight headset for civil aircraft, comprising: (a) a pair of earpieces, each earpiece including a casing provided at one side portion with a recess partly defined by two slits separated by a V-shaped member, said V-shaped member being integral at opposed ends thereof with said casing; (b) an opening located adjacent said recess and communicating therewith through said two slits, said opening having a side wall opposite to said V-shaped member, said side wall having two successive stepped portions, one of which is inclined to narrow said opening; (c) a circular hole is formed with the interior of said casing; (d) a pair of covering plates, each plate being embedded on each casing, each covering plate having a central recess and a tubular portion communicating with said central recess, said tubular portion having a smoothly curved surface; (e) a pair of ear cushions, each cushion mounted on each covering plate; (f) a headband having two ends, each end of which is inserted into the opening of each casing, said headband being provided at an inner side of each end with a plurality of protuberances terminating in a vertical edge and a cant at the outermost end; and (g) a pair of acoustic pipes, each pipe connected to the circular hole of each said casing and provided with a head having thereon a number of circumferential projections for engaging said circular hole.